Scared asf

When is the best time to take a pregnancy test ??

I'm suppose to get my period one of these days! My boyfriend and I have been having relationships and he came a little in me he says . I'm not on birth control or anything. Do to some health problems I have but I'm kinda scared I might be ! 😮😮 ahh! I'm okay if I am but I'm scared to be surprised! Lol